Editing Pennsylvania (section)

===Water===
{{see also|Port of Philadelphia|Port of Pittsburgh}}
The [[Port of Pittsburgh]] is the second-largest [[inland port]] in the United States and the 18th-largest port overall; the [[Port of Philadelphia]] is the 24th-largest port in the United States.<ref>Waterborne Commerce Statistics Center, p. 5-4.</ref> Pennsylvania's only port on the [[Great Lakes]] is located in Erie. The [[Allegheny River Lock and Dam Two]] is the most-used [[Lock (water transport)|lock]] operated by the [[United States Army Corps of Engineers]] of its 255 nationwide.<ref>{{Cite news|url=http://www.pittsburghlive.com/x/pittsburghtrib/business/s_699345.html|title=Corps shuts Highland Park lock for two weeks of repairs|last=Santoni|first=Matthew|date=September 14, 2010|work=Pittsburgh Tribune-Review|publisher=Trib Total Media|access-date=September 14, 2010|url-status=dead|archive-url=https://archive.today/20120908040557/http://www.pittsburghlive.com/x/pittsburghtrib/business/s_699345.html|archive-date=September 8, 2012}}</ref> The dam impounds the [[Allegheny River]] near [[Downtown Pittsburgh]].